.fa {
  width: 200px;
  height: 200px;
  background-color: pink;
}
.fa .son {
  width: 100px;
  height: 100px;
  background-color: powderblue;
}
.box1 {
  width: 100px;
  height: 100px;
  background-image: url('images/vue.png');
  background-repeat: no-repeat;
  background-size: 100% 100%;
}
.box2 {
  width: 100px;
  height: 100px;
  background-image: url('images/file_type_react.png');
  background-repeat: no-repeat;
  background-size: 100% 100%;
}
#lanBtn {
  background-color: aquamarine;
  width: 50px;
  height: 50px;
}
